diff --git a/similar/main/laser.cpp b/similar/main/laser.cpp
index d8bf357f6..0eb5a60a8 100644
--- a/similar/main/laser.cpp
+++ b/similar/main/laser.cpp
@@ -2106,7 +2106,6 @@ void create_smart_children(objptridx_t objp, int num_smart_children)
 #if defined(DXX_BUILD_DESCENT_I)
 		if (parent_type == OBJ_PLAYER) {
 			blob_id = PLAYER_SMART_HOMING_ID;
-			Assert(blob_id != -1);		//	Hmm, missing data in bitmaps.tbl.  Need "children=NN" parameter.
 		} else {
 			blob_id = ((N_weapon_types<ROBOT_SMART_HOMING_ID)?(PLAYER_SMART_HOMING_ID):(ROBOT_SMART_HOMING_ID)); // NOTE: Shareware & reg 1.0 do not have their own Smart structure for bots. It was introduced in 1.4 to make Smart blobs from lvl 7 boss easier to dodge. So if we do not have this type, revert to player's Smart behaviour..,
 		}
diff --git a/similar/main/multi.cpp b/similar/main/multi.cpp
index 370b51e13..46c3b1be4 100644
--- a/similar/main/multi.cpp
+++ b/similar/main/multi.cpp
@@ -1781,7 +1781,7 @@ static void multi_do_kill(const unsigned pnum, const ubyte *buf)
 	if (!multi_i_am_master() && type != MULTI_KILL_HOST)
 		return;
 
-	if ((pnum < 0) || (pnum >= N_players))
+	if (pnum >= N_players)
 	{
 		Int3(); // Invalid player number killed
 		return;
@@ -2186,7 +2186,7 @@ static void multi_do_play_sound(const unsigned pnum, const ubyte *buf)
 
 static void multi_do_score(const unsigned pnum, const ubyte *buf)
 {
-	if ((pnum < 0) || (pnum >= N_players))
+	if (pnum >= N_players)
 	{
 		Int3(); // Non-terminal, see rob
 		return;
@@ -2207,7 +2207,7 @@ static void multi_do_trigger(const unsigned pnum, const ubyte *buf)
 {
 	int trigger = buf[2];
 
-	if ((pnum < 0) || (pnum >= N_players) || (pnum == Player_num))
+	if (pnum >= N_players || pnum == Player_num)
 	{
 		Int3(); // Got trigger from illegal playernum
 		return;
@@ -2227,7 +2227,7 @@ static void multi_do_effect_blowup(const unsigned pnum, const ubyte *buf)
 	vms_vector hitpnt;
 	object dummy;
 
-	if ((pnum < 0) || (pnum >= N_players) || (pnum == Player_num))
+	if (pnum >= N_players || pnum == Player_num)
 		return;
 
 	multi_do_protocol_frame(1, 0); // force packets to be sent, ensuring this packet will be attached to following MULTI_TRIGGER
diff --git a/similar/main/multibot.cpp b/similar/main/multibot.cpp
index 91d847f9c..60ab705b0 100644
--- a/similar/main/multibot.cpp
+++ b/similar/main/multibot.cpp
@@ -916,7 +916,7 @@ void multi_do_create_robot(const unsigned pnum, const ubyte *buf)
 
 	objnum = GET_INTEL_SHORT(buf + 3);
 
-	if ((pnum < 0) || (objnum < 0) || (fuelcen_num < 0) || (fuelcen_num >= Num_fuelcenters) || (pnum >= N_players))
+	if ((objnum < 0) || (fuelcen_num < 0) || (fuelcen_num >= Num_fuelcenters) || (pnum >= N_players))
 	{
 		Int3(); // Bogus data
 		return;
diff --git a/similar/main/wall.cpp b/similar/main/wall.cpp
index 68e17c114..9ec10dc1f 100644
--- a/similar/main/wall.cpp
+++ b/similar/main/wall.cpp
@@ -1297,10 +1297,6 @@ void wall_toggle(int segnum, int side)
 // Tidy up Walls array for load/save purposes.
 void reset_walls()
 {
-	if (Num_walls < 0) {
-		return;
-	}
-
 	range_for (auto &w, partial_range(Walls, Num_walls, MAX_WALLS))
 	{
 		w.type = WALL_NORMAL;